<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8" />
		<title></title>
		<style>
				.left {
					float: left;
					width: 100px;
					height: 200px;
					background: red;
				}
				.right {
					float: right;
					width: 200px;
					height: 200px;
					background: blue;
				}
				.main {
					margin-left: 120px;
					margin-right: 220px;
					height: 200px;
					background: green;
				}
		</style>
	</head>
	<body>
		<div class="container">
		    <div class="left"></div>
		    <div class="right"></div>
		    <div class="main"></div>
		</div>
	</body>
</html>
